Avo analysis

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In geophysics and reflection seismology, amplitude versus offset (avo) or amplitude variation with offset is the general term for referring to the dependency of the seismic attribute, amplitude, with the distance between the source and receiver (the offset). Avo analysis is a technique that geophysicists can execute on seismic data to determine a rocks fluid content, porosity, density or seismic velocity, shear wave information, fluid indicators (hydrocarbon indications). In geophysics and reflection seismology, amplitude versus offset (avo) or amplitude variation with offset is the general term for referring to the dependency of the seismic attribute, amplitude, with the distance between the source and receiver (the offset). Avo analysis is a technique that geophysicists can execute on seismic data to determine a rocks fluid content, porosity, density or seismic velocity, shear wave information, fluid indicators (hydrocarbon indications). Avo analysis is a technique by which geophysicists attempt to determine thickness, porosity, density, velocity, lithology and fluid content of rocks. Successful avo analysis requires special processing of seismic data and seismic modeling to determine rock properties with a known fluid content. Avo analysis amplitude variation with angle or offset ava avo behaviour in pre-stack seismic gathers is a classic direct hydrocarbon indicator (dhi) based on the principle that variations in amplitude of a seismic reflection with angle of incidence or source-receiver distance (offset) are caused by fluid andor lithology changes in the reservoir. The amplitude versus offset (avo) phenomena on seismic data can provide substantial exploration and development information. Under good conditions the information extracted can be as detailed as an elastic layered model of the earth in the vicinity of the exploration or development target. To accomplish this goal, a systems approach to the problem is used. A review of avo analysis crewes research report volume 13 (2001) 363 an interesting phenomenon was noticed by carcione (1999). Avo principles, processing and inversion crewes research report volume 18 (2006) 5 r() r gsin2 p . (10) this equation is linear if we plot r as a function ofsin. We will then perform a 2 linear regression analysis on the seismic amplitudes to estimate interceptrp, and gradient g. Probabilistic avo analysis in probabilistic avo analysis the avo parameters and attributes are assigned probability density function (pdf) or cumulative density function (cdf) 29 impedance inversion the goal of geophysical inversion is to estimate model parameter from observed. Prestack amplitude inversion to derive the avo attributes must be applied to common-reflection-point (crp) gathers (migration velocity analysis), not to common-midpoint (cmp) gathers. This is because all the avo equations described in this section are based on a locally flat earth model that can be related to crp raypaths but not to cmp raypaths. Quantitative avo analysis is done on common-midpoint-gathers (or super-gathers, or common-offset gathers, or as they are called in the avo business ostrander gathers (ostrander 1984). At each time sample amplitude values from every offset in the gather are curve-fit to a simplified.

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